Hand lever device

Abstract

A hand lever device for operating a driven member includes a main lever arranged to be pivoted about a first rotational axis, a sub-lever arranged to be pivoted about a second rotational axis and retained in a stationary state at a set pivoted position, a returning member arranged to be rotated about a third rotational axis, and a cable coupled at one end to the driven member and linked at the other end with the main lever and the returning member. When the main lever is pivoted to a set position, it rotates the returning member about the third rotational axis and removes slack from the cable. Pivoting of the sub-lever further rotates the returning member about the third rotational axis to a selected operating position. An accelerating subsidiary lever that is also pivoted about the first rotational axis further pulls, via the returning member, the cable, thereby to further move the driven member.

What is claimed is:  
     
       1. A hand lever device for operating a driven member, comprising; 
       a main lever arranged to be pivotally manipulated about a first rotational axis;  
       a sub-lever arranged to be pivotally manipulated about a second rotational axis and retained in a stationary state at a predetermined pivoted position;  
       a returning member adapted to be rotated about a third rotational axis;  
       a cable adapted to be coupled at one end to the driven member and linked at the other end with the main lever and with the returning member, the cable being arranged to be pulled by a pivotal manipulation of the main lever to a set position to thereby rotate the returning member about the third rotational axis and also arranged to be further pulled from the above-mentioned pulled state by a pivotal manipulation of the sub-lever to further rotate the returning member about the third rotational axis to a selected position; and  
       an accelerating subsidiary lever which is adapted to be pivotally manipulated about the first rotational axis so as to further pull, via the returning member, the cable under a condition where the main lever is pivotally moved to the set position and the sub-lever is retained at the selected position.  
     
     
       2. The hand lever device according to claim  1 , wherein the main lever and subsidiary lever are configured such that the accelerating subsidiary lever is pivoted together with the pivoting of the main lever to the set position. 
     
     
       3. The hand lever device according to claim  1 , wherein the accelerating subsidiary lever and main lever are constructed such that when the accelerating subsidiary lever is pivoted up to the set position, the accelerating subsidiary lever can be locked with the cable being pulled to a predetermined extent, and when the main lever is pivoted up to the set position under the condition where the accelerating subsidiary lever is in the locked state, the locked state is unlocked by the pivoting of the main lever. 
     
     
       4. The hand lever device according to claim  2 , wherein the accelerating subsidiary lever and main lever are constructed such that when the accelerating subsidiary lever is pivoted up to the set position, the accelerating subsidiary lever can be locked with the cable being pulled to a predetermined extent, and when the main lever is pivoted up to the set position under the condition where the accelerating subsidiary lever is in the locked state, the locked state is unlocked by the pivoting of the main lever. 
     
     
       5. The hand lever device according to claim  3 , wherein the accelerating subsidiary lever and main lever have boss portions having inner end faces that contact each other and outer end faces contacting a case member, wherein at least one of the inner end faces is provided with a cam surface, and wherein when the accelerating subsidiary lever is pivoted up to the set position, the boss portions thereof are caused by the cam surface to shift outwardly, thereby causing the outer end faces to be pressed against the case member so as to produce a frictional force between the outer end face and the case member and achieving a locked state of the hand lever device. 
     
     
       6. The hand lever device according to claim  4 , wherein the accelerating subsidiary lever and main lever have boss portions having inner end faces that contact each other and outer end faces contacting a case member, wherein at least one of the inner end faces is provided with a cam surface, and wherein when the accelerating subsidiary lever is pivoted up to the set position, the boss portions thereof are caused by the cam surface to shift outwardly, thereby causing the outer end faces to be pressed against the case member so as to produce a frictional force between the outer end face and the case member and achieving a locked state of the hand lever device. 
     
     
       7. The hand lever device according to any one of claims  1 ,  2 ,  3 ,  4 ,  5 , and  6 , wherein the driven member is a carburetor throttle valve of an internal combustion engine.